Xem Studiomeasured geometry

Library › Boat design › Hull types ·

Flat-bottom hull

What is a flat-bottom hull good for? · Standard part · basis: Design rules and figures from the cited sources; example geometry by Xem Studio

Also called: flat bottom boat, flat bottom hull, jon boat hull, flat hull planing, shallow draft hull, rc flat bottom boat, scow hull, flat bottom skiff

Exact dimensions. True size, with no printing tolerance added.

sizes
1 in table

Notes

  • A flat-bottom hull is very stable, has low draft, planes easily with little power and is cheap to build, but gives the bumpiest, wettest ride in waves (BoatTest).
  • The bow may still have steep deadrise; transoms below 17 deg are described as flatter at the stern (BoatTest).
  • Used on: Jon boats, Skiffs.
  • The file is a reference example built by Xem Studio from the numbers above (Reference RC mono: 585 mm length and 20 deg transom deadrise (SV Design Stealthwake data); 181 mm is an unlabelled width in the same source's deadrise diagram.). Sizes the sources do not fix are illustrative; scale the example to your own vehicle.

Flat-bottom hull size chart

parametervalue or rangesource
Transom deadrisenear 0 deg (below 17 deg = 'flatter')BoatTest

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

BoatTestTo Deep-V or Not to Deep-VwebPublisher's page; dimensions are facts

Free files

★ Free files 1 parts. Xem Studio design: free to use, print and sell things from; not to be republished as files. Xem Studio Design License. index.json

flat-bottom-hull-hullflat hull, 585 × 181 mm, deadrise 0° (sections illustrative, scale to your boat)STEP · STL
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Plain text: sheet.txt · JSON: /api/geometry?object=flat-bottom-hull

Flat-bottom hull, isometric render of a generated part
Render of flat-bottom-hull-hull from the free STEP; not to scale.

Fits with

Deep-V hull, isometric render of a generated part
Deep-V hull6 sizes★ 1 file
Modified-V (semi-V) hull, isometric render of a generated part
Modified-V (semi-V) hull2 sizes★ 1 file
Cathedral (tri-hull), isometric render of a generated part
Cathedral (tri-hull)2 sizes★ 1 file
Tunnel hull (tunnel catamaran), isometric render of a generated part
Tunnel hull (tunnel catamaran)4 sizes★ 1 file
Three-point hydroplane, isometric render of a generated part
Three-point hydroplane4 sizes★ 1 file
Stepped hull, isometric render of a generated part
Stepped hull3 sizes★ 1 file

Questions

Why so bumpy?

With no V the bottom slams flat onto waves (BoatTest).